package week2.day8;

public class Demo {
 public static void main(String[] args) {
     Person p = new Person(18);
 }
}
class Person {
 int age = 10;
 static String nationality = "美国";

 public Person(int age) {
     this.age = age;
 }


 public Person() {
 }

 public Person(String nationality) {
     Person.nationality = nationality;
 }
}